i've got a 95 z28 pulled 425rwhp 406wtq. the car is a little less than full weight. it went 12.5 at 110 first time out. what other info would b helpful??

 

Your 60ft. time would be the most helpful,when a vehicle doesn't 'run the number' the 60ft. time should be the first thing to look at. All the power in the world won't run quick if it can't hook up

That and other info, weather conditions, track conditions, tires, tranny, suspension, etc... the more info the better.

 

k for one the track is bristol, tn. it was a little over 90 degrees & humid. the car is an m6 and it's not like i can't drive it i went 12.5 at 110 4 times in a row, the front of the car never drops and i'm shifting right where the dyno shows i quit makin power (6600 rpm). launching the car at about 5000rpm with et streets spinning was very minimal but cuttin 1.8 60' times. (not too good, i know) the track wasn't prepped too good, but it never is....they half *** it every time i've raced in the past. as for suspension the only things i've done are bmr lca, lca relocators. more soon to come. thanks for any input

 

bump...

 

try pulling your front sway bar off and that should help your weight transfers to improve your 60ft. also ,running in 90+ degree weather isn't helping out any either ,man.

 

Your MPH seems low for 425 RWHP.....my old 93 T/A would go 12.4x @ 109 and it had 50 less RWHP. Is your car tuned? You need a good torque arm to help help get your 60' time down.

 

Some cars just don't perform....

 

Especially Lt1's...

 

yeah the 90 degree weather sucks i'll try the front sway bar. car was tuned by bluecat (phillip smith, ky) bristol, tn is also a very high altitude track...on our local forum everybody says the track is .2 to .4 slower than most places but i don't know if they're trying to make their times sound better. as far as some cars don't perform...especially lt1's, i'm beginning to believe that! lol thanks guys and i'd appreciate any more input.

 

bump...

 

First, check the basics: Plugs, wires, fuel filter, etc.
Second, I'm not a stick shift guy, but you're probably granny shifting, or shifting to early. According to your dyno numbers, you should still be trapping at around 115 mph, even with the heat and humidity. In good weather, you should trap around 120. ET=traction/suspension, MPH=Power.

This is a prime example of why people shouldn't get caught up on dyno numbers until they take their car to the track.

 

no doubt on the dyno #s but no granny shiftin here....as soon as it leaves the front of the car never drops...i've always been able to jam the gears in this car.....it just feels like it has no ***** at the end of the run

 

What are you commanding for AFR at WOT, perhaps you are too rich.

 

Something is wrong...
What gears? Weight?
60' is not bad - But the mph don't add up to the hp numbers.
What's you 1/8th mile time and mph?

 

wat fuel pump and injectors you running. do you have a dyno tune or mail order. i put down 425 on a 125 shot and i trappe 117 in 90 degree weather and high humity. somethings diff. wrong

 

How about what the hell is done to it to make that kinda power? Maybe its a shitty dyno. I have a dyno sheet that says I put down 427rwhp and I know its full of ****. You only trapped at 110, your hp doesn't sound right at all

 

Yes but 100 more tq.


OP - DA will play a part...also I think you are stressing WAY TOO much on the dyno numbers. I'm not saying you shouldn't be a few MPH higher, but Dyno's are tools that's all. You haven't mentioned on what dyno type and what CF. Also, you haven't mentioned what tune you are running.

Cna you post the Time slips and the Dyno sheet? That may help us help you.

 

here's my dyno sheet.

 

my fuel pump setup is the walbro 255 gph i think. i have the 200 cc advanced induction h/c. street strip intake. 58mm holley. trick flow 36lb hr injectors. 1.6 comp roller rockers. 383 bottom. I know one thing that's killing me is bristol will not allow me to run open header. i ran it with cutouts corked through a system that on the dyno showed a gain of close to 50 hp when the headers were opened. input? thanks

 

is it a m6 or auto?

my bolt on only, less then 300rwhp LT1 car runs 12.40's.